QT interval alterations in epilepsy: A thorough investigation between epilepsy subtypes

Area of Science:

• Cardiology
• Neurology
• Epilepsy Research

Background:

• Sudden unexpected death in epilepsy (SUDEP) is a critical concern, often linked to cardiac disturbances.
• While focal epilepsies have been studied, generalized epilepsies lack comprehensive investigation regarding cardiac parameter differences.
• Electrocardiogram (ECG) parameters like QTc interval and QTcd are vital for assessing arrhythmia vulnerability.

Purpose of the Study:

• To compare ECG parameters, specifically QTc interval and QTcd, between patients with focal and generalized epilepsy.
• To investigate differences in these cardiac parameters between epilepsy patients and those with psychogenic non-epileptic seizures (PNES).

Main Methods:

• Retrospective review of medical records from epilepsy patients (October 2015-September 2016).
• Analysis included 66 generalized epilepsy patients and 64 focal epilepsy patients.
• Comparison of QTc interval and QTcd between epilepsy types and between epilepsy patients (n=130) and PNES patients.

Main Results:

• No significant difference in QTc interval or QTcd was found between focal and generalized epilepsy groups.
• Epilepsy patients demonstrated significantly longer QTc intervals compared to PNES patients (p=0.035).
• Epilepsy patients also showed significantly longer QTcd intervals than PNES patients (p<0.001).

Conclusions:

• Patients with epilepsy exhibit prolonged QTc and QTcd intervals compared to individuals with PNES.
• The origin of epilepsy (focal vs. generalized) does not appear to influence these ECG parameters.
• Prolonged QTc and QTcd in epilepsy may reflect an intrinsic susceptibility to cardiac arrhythmias, irrespective of seizure type.